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H. PIOKPORD 8v H. T. GREGORY.

ELECTRIC SIGNALING APPARATUS.

No. 252,797. Patented Jan. 24,1882. l N 1.,

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UNITED STATES PATENT Ori-ica HENRY PICKFORD AND HARRY T. GREGORY, OF CHELSEA, MASS.

ELECTRIC SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 252,797, dated January 24, 1852.

Application tiled July7, 1881. (Model.)

To all whom t may concern:

Be it known that we, HENRY Prokroun and HARRY T. GREGORY, of' Chelsea, in the State of Massachusetts, have invented an Improve.- mentin Electric SignalingApparatus, ot which the following is a specification.

Thisinveiition relates tothe devices by which the electric current in telephonie and other sound or signal transmitting apparatus is cut out or shunted, in order that such current may traverse the conducting-coil or pass through the shorter path, as may be desired; and the invention will, in connection with the accompanying drawings, be hereinafter fully described,and speciiically defined in the appended claims.

Figure lis a front elevation of an instrul'nenthaving our improvement applied thereto,and shown in theinclosing-case, from which the cover is removed, as secured to the wall or vertical support. Fig.2 is a horizontal section taken on line oc, Fig. 1. Fig. 3 is a detached section taken through the axis ot' the cranksleeve-,its threaded socket,the elastic contactringer, and its securing-screw. Fig. 4 is a detached view, showing the side of the case in vertical section, and the con tact-washer, a portion of the crank-shaft, the crank, and the contact-linger in elevation. Fig. 5 is a detached vertical section taken on line B B, Fig. 1.

In said views, A represents the wail or vertical support, to v.which the back a of the case is secured, and to said back the horseshoemagnets b b b are secured in the usual manner, and are inclosed by the walls ot the case, the sides of which are shown at o o and the ends at d d. At the open end of said magnets b is journaled the small arbor f, upon which are mounted the armatures and insulated conducting wire or coils, as shown in elevation at c in Fig. 2; and upon said arbor' fis mounted the friction-disk g,which is engaged by the grooved faced driving-disk h, which is rigidly mounted upon arbor t', which, when rotated, carriesits said disk h, and the frictional contact thereof with disk g serves to rotate its arbor f and the said armatures and coils of wire thereonmounted; but as all the parts thus far referred to are old and well known, and may be of any of the usual kinds, a further or more detailed description is not deemed necessary.

For the purpose ot'journaling and supporting said shaft/, we haveinvcnteil the following means or devices: Upon the disk m, in which one end of arbor j' isjournaled, we form the socketed arm Z, in which is closely itted the round arm r, formed upon sleeve j, in which latter said arbor t' is mounted and revolves. The arm It, being round and secured in position by set-screws n, Fig. 4, admits ot' the desired delicate adjustment, both lineallyand in plane, of disk lt relatively to disk g, in order to secure the desired amount ot' frictional contact between them, said arbor i being held from lineal displacement relativelyv to its sleeve j by means of the engagement ot disk /r with said disk g, the arborj', upon which the latter is mounted, being shouldered in its bearings, and so held from end motion.

For the purpose ot' makingand breakingcontact in order to cut out or change the direction ot' the current, we have invented the following devices: A socket, a, having a round anglearm, t, is threaded or otherwise removably attached to shaft y, outside of the case. Upon said angle-arm t is mounted a coiled spring, o, and a crank-arm, y, the latter having an axial passage equal to the outer diameter ot' spring o, to receive both s iid spring and the arm t, which latter is inserted in said spring. The ends ot said spring c are respectively secured in the wall of socket a and in the body of arm g/ at the base ot' its axial passage, as shown in Figs. 2, 3, in order that the torsional force ot' such spring may actuate arm @,in the manner and for the purpose to be described. Ashort arm, a', which is an extension ot' the wall ofarnl y, extends across and beyond the dia-metric t'ace of socket u, the inner face of said arm a being arranged at a sufficient distance from the diametrio face of the socket to allow a slight rocking or rotary motion of. arm y on the interior arm, t. A screw, b, is threaded in arm a', exactly opposite arm t ot' socket n, and at such distance from said socketthat the elastic coiled wire finger o', which is secured on said screw, by its threads engaging the coils ofthe spring, will, by its contact with socket a, prevent lineal displacement ofarm y. Said screw b is so positioned in arm a and the elastic finger o is ot' such length that when at rest said tinger will bear against theinsulated and perforated disk IOO d', secured to side c of the case, and through which shaft yi passes, as shown by solid lines in Fig. 1, but when force is applied to the han dle or wrist-pin z ot' crank-arm i/ in the direction indicated by an arrow in Figs. 1, et (for the purpose of rotating shaft t' and its disk It) the crank arm y will be slightly rocked upon the interio arm, t, thereby vibrating uger c' and disconnecting it from disk d', asis shown by dotted lilies in Fig. 1 -and by solid lines in Figs. 2, 4; but when handle .e is released the torsional force of spring v, acting upon arm y, will rotate or rock the same so as to bring ringer c again into contact with disk d.

The practical employment or operation of our invention is as follows: r1he usual linewire in is shown and indicated in Fig. 1, and is so connected that the current entering thereby will, when not shunted, pass through the coils e' on arborf, and thence through the out line, (shown in Fig..2,) but when the crank is at rest the current will pass in the usual manner through arbor if, its crank, tinger c', disk d', and the shunt line, (shown and indicated in Fig. 2,) and thence by theindicated main out line; but when it is desired to cutout the shunt in order to send the cnrrent through coils c', in order to sound a calibell in the main oflice, or for other purposes, the disk-shaft i is rotated bythe means dcscribed, and the force exerted for that purpose on the crankhandle z will, as explained, disconnect finger c from disk d', thereby insulating the game, when the current must pass through the said coils, as before stated, and hence this part of our invention has relation to the devices by which the current may be cut out, so as to compel it to either pass through said coils or to avoid the same, as may be dcsired.

Te do not claim in the abstract a generator having its circuit autoniatically broken by the revolution ot' the driving mechanism; but

le do claim as follows:

1. In an electrical instrument, the combina tion ot the support m of arbor j', formed with the sockcted extension l, and the sleeve-like bearingj of arbor i, formed with the cylindrical extension 7.2, to be seated, adjusted, and locked in socket if, whereby the driving-disk It on arbor t' can be adjusted bothlineally andin plane relatively to disk g on arborj", substantially as spccilied.

2. In an electrical instrument, the combination of hollow crank-arm y, with its handle s, the internal arm, t, the -coiled spring 0, the short arm c', and a contact-linger projecting therefrom, all substantially as specified.

3. ln au electrical instrument, and in combi nation with its electric circuits, a erankarm constructed and arranged to be rocked, rotated, or vibrated bythe force. exerted ugon its wristpin or handle, and a contact-linger projecting from such crank-arm and arranged to be thereby vibrated to make and break contact, substantially as specified.

ai. In an electrical instrument, and in combination with its electric circuits, an actuatingcrank constructed and arranged to rock, rotate, or vibrate, and an elastic yielding contact-finger arranged to make and break contact bythe action ofsuch crank, substantially as specified.

5. In an electrical instrument, acontact iinger or point composed of the securing-screw b, suitably secured and supported, and the coiled wire Spring c', mounted upon and held in position bythe engagement ot' its coils with the threads of said screw, substantially as specified.

HENRY PICKFORI). HARRY T. GREGORY.

Witnesses:

THOMAS W. Pou'rnu, WM. ADAMs. 

